Difference between revisions of "CountingDaq 210120"

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**  Paul:  rough estimate of data rate based on occupancy guesses --- [https://moller.jlab.org/DocDB/0006/000685/001/moller_counting_daq_20210120.pdf DocDB 685]
 
**  Paul:  rough estimate of data rate based on occupancy guesses --- [https://moller.jlab.org/DocDB/0006/000685/001/moller_counting_daq_20210120.pdf DocDB 685]
 
*  General discussion
 
*  General discussion
 +
 +
 +
==  Minutes ==
 +
Participants:  B. Moffit, C. Ghosh, H. Liu, R. Michaels, J. Fast, P. King
 +
 +
*  Follow-up on discrepancy between Chandan's and Nilanga's channel count:  Chandan had used the dimensions in the CDR, which are out-of-date and a little larger than current.  Using the current dimensions resolves the discrepancy in channel count.  There will be 1280 channels per module.
 +
*  Data rate estimate discussion
 +
**  Bryan says that the data suppression is done in the SSP rather than in the MPD.  The links from MPD to SSP can support 1Gb/s.
 +
***  Based on the calculations in DocDB 685, we'd currently expect ~0.65 Gb/s from each MPD (for 3 samples per trigger at 7kHz trigger rate)
 +
***  Bryan mentions that they are working to get 2 Gb/s links from MPD to SSP for SBS
 +
**  Chandan reminds us that the data from the MPDs includes headers, although these are a smaller fraction compared to the actual samples
 +
**  Open question about occupancy
 +
***  Chandan reported that the PREX GEM modules had about 8-9 strips above pedestal for each track (total for both X and Y planes in the module)
 +
***  Chandan will check in simulation what the particle rate at the GEM modules will be
 +
*  Developing the DAQ design
 +
**  Bob reminds us that the preliminary design review milestone is mid-March, with the counting mode DAQ design to be complete in June.
 +
**  Bob will be in charge of defining the reviews
 +
**  Expect that the review will take ~1/2 day

Latest revision as of 19:26, 28 January 2021

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Meeting information

 Meeting time:  2:00pm Eastern
   
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Agenda

  • Follow-up from last meeting
    • Chandan: discrepancy with Nilanga's channel count docDB 683_page12-13
    • Paul: rough estimate of data rate based on occupancy guesses --- DocDB 685
  • General discussion


Minutes

Participants: B. Moffit, C. Ghosh, H. Liu, R. Michaels, J. Fast, P. King

  • Follow-up on discrepancy between Chandan's and Nilanga's channel count: Chandan had used the dimensions in the CDR, which are out-of-date and a little larger than current. Using the current dimensions resolves the discrepancy in channel count. There will be 1280 channels per module.
  • Data rate estimate discussion
    • Bryan says that the data suppression is done in the SSP rather than in the MPD. The links from MPD to SSP can support 1Gb/s.
      • Based on the calculations in DocDB 685, we'd currently expect ~0.65 Gb/s from each MPD (for 3 samples per trigger at 7kHz trigger rate)
      • Bryan mentions that they are working to get 2 Gb/s links from MPD to SSP for SBS
    • Chandan reminds us that the data from the MPDs includes headers, although these are a smaller fraction compared to the actual samples
    • Open question about occupancy
      • Chandan reported that the PREX GEM modules had about 8-9 strips above pedestal for each track (total for both X and Y planes in the module)
      • Chandan will check in simulation what the particle rate at the GEM modules will be
  • Developing the DAQ design
    • Bob reminds us that the preliminary design review milestone is mid-March, with the counting mode DAQ design to be complete in June.
    • Bob will be in charge of defining the reviews
    • Expect that the review will take ~1/2 day
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